Glyphosate and Parkinson’s Disease: Examining the Evidence
Introduction
Movement, balance, coordination, and many non-motor activities are all impacted by Parkinson’s disease (PD), a degenerative neurological condition. Researchers are becoming more aware that environmental exposures may also have an impact on the development of Parkinson’s disease, even though heredity plays a role in some cases. Exposure to pesticides and herbicides is one of the environmental causes that is getting a lot of attention.
Glyphosate, the active component of many weed-control treatments, is one herbicide that has sparked a lot of debate. Glyphosate, the most popular herbicide in the world, is utilized in public areas, residential settings, landscaping, and agricultural. Long-term glyphosate exposure has raised concerns about potential links to neurological conditions like Parkinson’s disease.
Glyphosate: What Is It?
A broad-spectrum herbicide called glyphosate was created to get rid of undesirable plants and weeds. It has grown to be one of the most widely used agricultural pesticides in the world since its debut in the 1970s. Concerns about environmental contamination and possible consequences on human health have arisen as a result of its widespread use.
The effects of glyphosate on several biological systems, including the neurological system, have been studied by researchers. Glyphosate may be involved in oxidative stress, inflammation, mitochondrial dysfunction, and changes in the gut microbiome, all of which have been linked to the pathophysiology of Parkinson’s disease, according to experimental research (Bloem, 2023; Cheng, 2022).
The Potential Association with Parkinson’s Disease
Dopamine-producing neurons in the brain eventually deteriorate, leading to Parkinson’s disease. Scientists believe that both genetic predisposition and environmental exposures contribute to illness risk, even though the precise explanation is yet unknown.
Parkinson’s disease and pesticide exposure have long been linked, according to research. other pesticides, including paraquat, rotenone, and other organophosphate chemicals, have been associated in numerous epidemiological studies with an elevated risk of Parkinson’s disease (Kulcsároň et al., 2023).
Regarding glyphosate, the evidence is less conclusive. Glyphosate may encourage biological alterations linked to dementia, such as inflammation and harm to dopamine-related circuits, according to certain laboratory and animal research (Cheng, 2022). Parkinsonian symptoms following severe glyphosate exposure or poisoning episodes have also been reported in case studies (Eriguchi et al., 2019).
Furthermore, some academics think that there is enough biological plausibility to support additional research into glyphosate’s possible involvement in the development of Parkinson’s disease (Bloem, 2023).
What Does Research Indicate?
A complicated picture is presented in scientific literature.
Parkinson’s disease risk has been linked to pesticide exposure, particularly glyphosate exposure, according to certain reviews and research (Santos et al., 2025). Glyphosate may cause neuronal damage through several pathways, including oxidative stress, neuroinflammation, and disruption of mitochondrial function, according to research.
However, no statistically significant link between glyphosate uses and Parkinson’s disease has been discovered by other excellent epidemiological investigations. The strongest known human studies did not consistently show a link between glyphosate exposure and Parkinson’s disease risk, according to a thorough systematic analysis (Chang et al., 2023).
Because of this, many scientists now believe that there is no conclusive evidence linking glyphosate to Parkinson’s disease, even though there are concerns and more research is necessary.
The Importance of Ongoing Research
A larger problem in Parkinson’s disease research is brought to light by the glyphosate controversy. Establishing direct cause-and-effect linkages is challenging since many environmental exposures take place over decades. The actual Parkinson’s disease frequently takes years to manifest symptoms.
Researchers are still looking into the potential interactions between genetic risk factors, aging, and other environmental factors and long-term exposure to pesticides and herbicides. Gaining knowledge of these connections may help develop public health and disease prevention initiatives.
A Precautionary Approach
While the scientific community continues to evaluate glyphosate’s role in Parkinson’s disease, many health advocates support efforts to reduce unnecessary pesticide exposure whenever possible. This includes promoting safer alternatives, strengthening worker protections, improving transparency regarding chemical use, and investing in independent scientific research.
For families affected by Parkinson’s disease, these questions are deeply personal. Every new study brings us closer to understanding the environmental factors that may contribute to this devastating disease. Continued research, public awareness, and evidence-based policymaking remain essential as scientists work toward uncovering the causes of Parkinson’s disease and ultimately finding a cure.
TogetherForSharon® – In memory of Sharon, to voice awareness and hope for a Parkinson’s disease cure.
References
Bloem, B. R. (2023). The case of glyphosate and Parkinson’s disease. The Lancet Planetary Health, 7(11), e857–e858.
Chang, E. T., Delzell, E., & Cole, P. (2023). Systematic literature review of the epidemiology of glyphosate exposure and neurological outcomes. International Archives of Occupational and Environmental Health, 96(2), 171–188.
Cheng, L. (2022). Glyphosate may be linked to neurodegenerative diseases through inflammatory pathways. The New Lede.
Eriguchi, M., Iwasaki, Y., Yoshida, M., & Nagatomo, M. (2019). Parkinsonism relating to intoxication with glyphosate. Internal Medicine, 58(14), 1935–1938.
Kulcsárová, K., et al. (2023). Pesticide exposure and Parkinson’s disease: Emerging evidence and future directions. Journal of Parkinson’s Disease, 13(8), 1243–1258.
Santos, J. R., et al. (2025). Pesticide exposure and the development of Parkinson disease. Frontiers in Public Health, 13, 1558022.